Fuel injection pump



Deaze, 1939. l H. c. EDWARDS 2,185,146

FUEL INJECTION PUMP Filed Oct. 8, 1937 3 Sheets-Sheet l 4 3 9 35M 26V f4 17942.60/ f/ /7 59 Ll l l l ,L4 o o 7 9 will;

VS2 OH fee Dec. 26, 1939.

H. c. EDWARDS 2,185,146

FUEL INJECTION PUMP l Filed Oct. 8, 1957 3 Sheets-Sheet 2 Decn 26, 1939. HC- EDWARDS 2,185,146

' FUEL INJECTION PUMP FledlOCt. 8, 1937 5 Sheets-Sheet 3 722% i if VPatented Dec. 426, 1939 FUEL INJECTION PUMP Herbert C. Edwards, Massillon, Ohio,`assignor toI The Timken Roller Bearing Company, Canton, Ohio, a corporation of Ohio Application October 8, 1937, Serial No. 167,972

17 Claims.

'I'his application is a `continuation in part of my copending application for patent for improvement in Fuel injection pump, Serial No. 145,001 filed May 27, 1937.

The invention relates principally to fuel injection pumps of the kind having a plurality of' reciprocating plungers that are rotated in their respective cylinders to regulate the quantity of fuel delivered. It has for its principal objects to provide for the quick and easy insertion and removal of the 'individual pump assemblies as complete preassembled units;A to provide for properly positioning'the pump units in the pump housing; to insure proper enmeshment of the plunger rotating pinions and the operating rack therefor; to obtain a uniform distribution of the wear on the tappet engaging surfaces of the tappet cups; and to provide for simplicity of construction, reduced cost of manufacturing, reduction in weight and compactness of design.

In the accompanying drawings, which form part of this specification and wherein like symbols refer to like parts wherever they occur,

Fig. 1 is a plan view of a fuel injection pump embodying my invention,

Fig. 2 is a side vertical central longitudinal section through the -lower portion of the pump.

Fig. 3 is a vertical cross-section through the upper vportion of the pump on the line 3 3 in Fig. 1, i

Fig. 4 is a vertical transverse section on the line 4 4 in Fig. 1,

Figs. 5, '6, '7. 8 and 9 are fragmentary horizontal cross-sections on the line 5 5, 8 6, `1 8 8, and 9 9, respectively, in Fig. 4,

Figs. 10 and l1 are fragmentary cross-sections similar to Fig. 6, showing how the removable pump unit clears the teeth of the rack bar when the unit is inserted in .and removed from the pump housing, 1

Fig. 12 isa side elevation of the drivingsleeve of one of the pump units,

Fig. 13 is a bottom plan .view of said driving sleeve,

Fig. 14 is a side elevation of .the driven sleeve of one of the pump units,

Fig. 15 is a plan view of said sleeve,

Fig. 16 is aside elevation of one of the removable pump units,v

Fig. `17, is a plan view of a portion of the pinion turning rack rod,

Fig. 18 is a fragmentary plan view of a modified pump construction,

Fig. 19 is a plan view of one of the plates for angularly adjusting the pump units in the pump housing,

Fig. 20 is a vertical cross-section through the upper portion of said pump, the section being taken through one of the cylinderson the line L5 20-20 in Fig. 18; and i Figs. 21 and 22 are horizontal cross-sections on the line 2I 2I and 22-22, respectively, of Fig. 20.

In the accompanying drawings, my invention 10 is shown in connection with a fuel injection pump comprising a suitable housing I provided with 'a plurality of vertical bores 2 that are spaced apart lengthwise of said housing and lead downwardly through the top thereof into a longitudinal cham- 1 ber 8 in the bottom thereof, within which is located a cam shaft 4 that is journaled in suitable bearings 4a in the end walls of said housing and is provided with lobe-shaped cams .or tappets 5 adapted' to ,engage tappet cups 6 slidably 20 mounted in thelower portions of said vertical bores.

Located in each ofthe vertical bores 2 of the pump housing I is a pump assembly that is adapted and arranged for insertion in and re- 25 moval from said bore as a complete preassembled their upper ends with nuts II that bear against 35 theupper surfaces of said ears or lugs and thus hold said supporting sleeve against both axial and rotary movement in the housing bore. The supporting sleeve 1 has its lower end portion re-y f duced to liorm an annular shoulder I2; andthe -140 hou'singb'ore is provided just below said shoulder with an annular seat adapted to receive a suitable gasket I3. Said supporting sleeve is also provided just below the outstandinglugs or ears 9 adapted to receive a gasket` I4. The gaskets I3 and I4 serve to rprevent leakage past the ends 'of the supporting sleeve. l

Mounted in the supporting'sleeve 'I' of each f at the upper end thereof with an annular groove 45 pump unit is a pump cylinder or barrel I1 hav- 50 spring 25. This valve seat member projects into the lower end of the axial bore of a tubular I upper end of said cylinder. 'I'he cylinder I1 is prevented from rotating in its supporting sleeve 1 preferably by means of a pin. 22 that is mounted in a radial hole in the wall cf said supporting sleeve with its inner end seated in a recess provided therefor in the exterior surface of the head I8 of said cylinder. The bore of the tubular member 20 terminates at its upper end in a conical seat 23 for a suitable valve 24 that is held down on said seat by means of a coil compression shell o r tting 26; and the valve spring 25 is held under compression in said axial bore or passageway between a' shoulder in said bore and a s eat on the valve 24. A suitable Washer or gasket 21 is interposed between the lower end of the tting 26 and the base flange 2| of the valve seatl member 20 for preventing leakage therebetween.

This fitting is threaded into the upper end` of the bore of the supporting sleeve 1 and has itsv upper end threaded for connection with a fuel line (notshown) that leads to a fuel injector (not shown). This spring holder or fitting serves to hold the valve seat member 20 down on the head I8 of the cylinder I1 and said h'ead down on the annular seat I9 provided therefor in the bore of the supporting sleeve 1.

The head I8 of each pump cylinder I1 is provided on one side with a radial inlet port 28 and on the opposite side with a radial overflow, metering or by-ps port 29; and the cylinder` supporting sleeve 11s provided at about the level .of said ports with a pair of spaced parallel bores 30 that pass through said sleeve transversely thereof on opposite sides of its axis and open into the bore thereof and communicate with the respective ports. The pump housing I is provided in its opposite ends' at about the level of the' receiving recess at the opposite end thereof.`

These longitudinal bores are disposed on opposite sides of the axes of the vertical bores 2 of the pump housing, open into said bores and register with the bores 30 in the supporting sleeves 1 to form a passageway on one side of the cylinders that communicates with the inlet ports 28 thereof and a passageway on the *other side of said cylinders that communicates with the overflow or by-pass ports 29 thereof.

Mounted for both rotary and axial sliding movement inthe bore of -the cylinder or barrel I1vof each pump unit is a plunger or piston 35 of the general type having an annular groove 36 therein that communicates through a longitudinal peripheral groove 31 with the pressure space above said plunger and has an inclined or helical upper' edge 38, whereby said plunger may be turned in its cylinder to vary vthe point'in itsdelivery stroke in which the overiiow port 29 is placed in communication 'with said pressure space through the grooves 36 and 31. By this arrangement, delivery of the fuel begins as soon as the plunger on its way up .eoversthe ports 28 and 29 and'ends as soon as the helical upper edge 38 of the annular groove 36 in the plunger opens the said plunger below said driving sleeve.- This nony rotatable connection comprises a iiatsided portion 43 on the plunger that fits a similarly shaped opening 43a in the lower end of the driven sleeve 42. The driving connection between the driving sleeve 48 and the driven sleeve 42 comprises upwardly extending diametrically opposed tongues or tangs 44 on the driven sleeve that fit within downwardlyy opening diametrically opposed notches 45 located in the driving sleeve vbelowa hub portion 4I thereof located just below the pinion 39 thereon, thereby permitting relative axial movement of the two sleeves, but prevent-` ing relative rotary movement thereof.

Surrounding the drivingv sleeve 40 and the driven sleeve 42 of each pump unit is a helical compression spring 46 that serves to retract the plunger. The tappet cup 6 surrounds the driven sleeve but is spaced far enough therefrom to accommodate theplunger retracting spring. `Sur rounding the upper portion ofthe driving sleeve 40 and the reduced lower vportion of the main supporting sleeve 1 is a combination spring seat and driving sleeve support 48 comprising an an-` nular spring seat 48ar and an upward sleeve extension 48h whose upper end abuts against the annular shoulder I2 formed by said reduced lower portion of said main supporting sleeve. The length of thel spacing sleeve or extension 48h of the member 48 is such that the driving sleeve 40 is supported on said spring seat portion 48a of said member witha slight clearance space between the upper end of said pinion 39 and the l lower end of the main supporting sleeve 1.

The plunger 35 is provided below the lower end of the driven sleeve 42 with an annular groove 49 and terminates below said groove in a fiat sided head portion 50. The lower end of the plunger retracting spring 46 is supported on an annular seat provided therefor on a member 5I having a lateral notch 52 therein, having a `narrow upper portion that snugly receives the grooved portion 49 of the plunger and a wide lower portion that receives the head 50 at the lower end of said plunger. Thus, the spring seat member 5I is held againstaxial movement relative to the-plunger but may rotate relative thereto and may be removed sidewise therefrom. 'I'he bottom wall of the driven sleeve 42 fits between the upper end of the spring seat member 5I thereon and a collar 35aformed integral with the plunger, thereby preventing relative axial movement of said sleeve and said plunger.

The spring seat 5I has a lower portion 53 of reduced diameter that bears against the'bottom of the tappet cup 6, whose side walls are pro` vided opposite ,said reduced portion with one or more oil drain and breather openings 54 through whichV access may be had to said spring seat for tappet inspection. Access to the openings 54 in the tappet cup 6 may be had through'an open'- ing 55, which is located in one side of the pump housing Iy adjacent to -the lower end of said cup and is closed by means of a screw` plug 56.Y 'I'he usl breather plug 51 provided with suitable filtering screens 58.

The tangs or fingers 44 of the drivensleeve 42. overlap the lower end portion of the cylinder |1 in all positions of the axial sliding movement of said sleeve and are provided with inwardly extending hooks or lugs 44a that fit within an annular groove |1a provided therefor in the peripheral surface of said cylinder. These hooks or lugs 44a are clear of the lower edge of the annular groove |1a in the operative position of thepump unit, but are adapted to bear against said edge of said groove when the pump unit is removed from the pump housing and thus retain `the plunger retracting spring 46 under tension` `and preventI separation ofthe parts of the -detached unit under the pressure of said spring.

,in a longitudinal bore 68 provided therefor in the pump housing I and has one end extending beyond sai/d pump housing for connection with a suitable mechanism (not shown) for reciprocating said rod, no fuel being delivered by the pump when said rod is at one end of its reciprocating movement and a maximum quantity of fuel being delivered'when said rod is at the other end of said movement. Axial sliding movement of said rod is limited by a stop screw 59a'that is threaded through the side of the pump housing and extends into a longitudinal groove 59h provided therefor in said rod. The rod is provided opposite each pinion 39 with a series of rack teeth 6| that intermesh with the teeth of said pinion. Near the no delivery end of each series of rack teeth 6| is a tooth space 62, the purpose of which y, will hereinafter appear, which is wide enough to receive two adjacent teeth of the pinion driven` thereby.

Mounted on the hub 4| of the driving sleeve 40,

` just below the pinion 39 at the upper end thereof,

, with the pinion 39 of saidsleeve.

The combined spring vseat and driving sleeve supporting member 48 is flattened, as at 48e, on its rack opposing side below the level of the pinion 39 to permit the lower end portion of said member to clear the rack teeth 6| when the unit is inserted in and removed from the bore in the pump housing. These flattened faces also insure positioning of the pump unit in one position only in the pump housing bore. The wall of the sleeve extension 48h of the member 48 is provided on its flattened rack opposing side 48e with an opening 48d so as to permit the pinion 39 to engage the rack teeth 6|. The upper edge o f this opening is provided with an inwardly extending tab or tongue 48e that fits into a notch provided 'therefor in the reduced lower end of the supporting sleeve 1 and thus prevents rotation of the spring seat when the driving sleeve 40 is rotated.

As shown in the drawings, the tappet cups 6 have convex spherical bottom surfaces 6a; and the cams or tappets 5 have conical surfaces 5a that have tangential engagement with said tappet cups surfaces at points that are offset from the vertical axes of said cups, with the resultA that the cups are rotated during the operation of the pump, thereby distributing the wear evenly around the cam engaging surfaces of the cups. The cams 5 are all tapered in the same direction so that any effect of the tappet cup rotation on the metering action of the units will be the same on all units.

In the modified construction'shown in Figs. 18 to 22, inclusive, the pump cylinder |1 is angularly adjusted in the supporting sleeve 1a by means of a screw plug 61 that is mounted in a threaded radial bore in said sleeve and has an eccentric pin 68 that extends into the overflow port 29.0f said cylinder. Rotation of this plug causes the eccentric pin to turn about the axis of said plug and force the cylinder to rotate in its supporting sleeve and thus vary the position of the helical edge 38 of the annular groove 36 of the plunger 35 relative to the overflow port. In this construction, the entire pump assembly or unit is angularly adjusted in the vertical bore of the pump housing by means of a plate 69 that has a fiatsided opening therein adapted to receive a similarly shaped fiatsided portion on the upper end of the cylinder supporting sleeve 1a.

This plate is secured flatwise to a removable top,

cover portion la of the pump housing by means of a nut 1|) that is threaded on a stud 1|, which is fixed to said housing and extends upwardly through said lcover and through an arcuate slot 12 provided therefor in said plate. By this arrangement, the pump unit may be turned in the bore in the pump housing and then locked in the desired position of adjustment by tightening the nut 10. This nut bears against the upper surfaceof the plate 69. The cover plate Iabears against an annular shoulderlb provided therefor on the cylinder supporting sleeve 1a and thus serves to hold the pump assembly in the housing.

The hereinbefore described fuel injection pump vhas numerous advantages. It permits the entire pump assembly to be inserted in and withdrawn from the bore of the pump housing as a complete pre-assembled and accurately adjusted unit. 'I'he main `supporting sleeve serves to rigidly hold the unit against both rotary and axial movement in.

the bore of the housing. The fiatsided portion of the combined spring seat and driving sleeve support 48 makes it impossible to insert the unit in the pump housing bore in any position except the correct position. 'The tooth 66 on the indexing washer 63 iits only the Wide tooth space 62 of the rack, whereby the pinion 39 cannot be meshed with said rack except when said tooth passes through said wide tooth space, thereby insuring proper enmeshment of said pinion and `said rack. 'Ihe off-center engagement between the conical surfaces of the cams and the spherical bottom surfaces of the tappet cups serve to impart a spinning movement -to said cups and thus prevents the Wearing of fiat spots on said tappet cup surfaces. The' tapering of all ofthe cams in the same direction causesall of the tappet cups to rotate in the same direction and thus renders any effect that such rotation may have on the fuel delivery of the respective units, the same for each unit. Each pump unit assembly may be quickly and easily detached for inspection or repair merely by removing the nuts that clamp the supporting sleeve to the top of the pump housing and withdrawing said unit from the bore thereof, leaving the tappet cup only in stop screw and withdrawing the rack rod.

What I claim is:

l. A pump assembly adapted for attachment to and detachment from a pump housing as a complete preassembled unit, said assembly comprising a supporting sleeve, a cylinder supported therein and extendingtherebelow, a plunger reciprocable in said cylinder and means for rotating said plunger in said cylinder, said means comprising a driving sleeve journaled on said cylinder below said supporting sleeve and having an axially slidable but nonrotatable connection with said plunger, a plunger retracting spring surrounding said driving sleeve, a seat on said plunger for the lower end of said spring, means for preventing endwise separation of said cylinder and plunger under the action of said plunger retracting spring, and a member surrounding said driving sleeve between said supporting sleeve and said spring and constituting a support for said driving sleeve and a seat for the upper end of said spring, the upper end of said member being held by said spring in abutting relation with the lower end of said supporting sleeve, whereby said driving sleeve is relieved of the pressure of said spring, said member and said driving sleeve being otherwise free from'connections that would prevent endwise separation thereof.

2. A pump assembly adapted for attachment to and detachment from a pump housing as a complete preassembled unit, said assembly comprising a supporting sleeve, a'cylinder supported therein and extending therebelow, a plunger reciprocable in said cylinder and means for rotating said plunger in said cylinder, said means comprising a driving sleeve journaled on said cylinder below said supporting sleeve, a driven sleeve lixed to said plunger, and having an axial slidable but nonrotatable connection with said driving sleeve,

said driving sleeve having a pinion rigid with the upper end thereof, a plunger retracting spring surrounding said sleeve below said pinion, a seat on said plunger for the lower end of said spring, means for preventing endwise separation of said cylinder and plunger under the action of said plunger 'retracting spring, means on said driven sleeve cooperating with means von said cylinder for preventing endwise separation thereof under the action of said spring, and a member seated on the upper end of said spring and constituting a support for said driving sleeve and a seat for the upper end of said spring, said member being held by said spring vagainst the lower end of said supporting sleeve, thereby preventing the pinion end of said driving sleeve from being forced against the lower end of said supporting sleeve by the pressure of said spring, said member and said driving sleeve being otherwise free yfrom connections that would prevent endwise reciprocable in said cylinder and means for ro-,l

tating said plunger in said cylinder, said means comprising a driving sleeve .journaled on said cylinder below said supporting sleeve and having an axial slidable but nonrotatable connection with said plunger, said driving sleeve having a pinion formed on; the upper end theresof, a

plunger retracting spring surrounding said sleeve below said pinion, and a cylindrical spacing sleeve surrounding the pinion portion of said driving sleeve and constituting a support for said driving sleeve and a seat for said spring, said spacing sleeve being held by said spring in abutting relation to the lower end of said supporting sleeve, thereby relieving said driving sleeve of the upward thrust of said spring, said spacing sleeve having a non-rotary connection with said supporting sleeve comprising a tab extending inwardly from the upper edge of said opening and seating in a notch provided therefor in the lower end of said supporting sleeve, said spacing sleeve being provided on one side opposite said pinion with an opening adapted to lpermit engagement of said pinion with an operating rack therefor.

4. A pump assembly adapted for attachment.

to and detachment from a pump housing as a complete preassembled unit, said assembly comprising a supporting sleeve, -a cylinder supported therein and extending therebelow, a plunger reciprocable in said cylinder and means for rotat: ing said plunger in said cylinder, said means comprising a driving sleeve journaled on said cylinder below said supporting sleeve and having a pinion thereon and an axial slidable but nonrotatable connection with said plunger, a plunger retracting spring surrounding said sleeve,.a seat on said plunger for the lower end of said spring, means for preventing endwise separation of said cylinder and plunger under the action of said plunger retracting spring, and a cylindrical spacing sleeve surrounding said pinion and a portion of the driving sleeve located therebelow and constituting a support for said driving sleeve and a seat for the upper end of said spring, the upper end of said spacing sleeve being held by said spring in abutting relation to the lower end of said supporting sleeve, said spacing sleeve and said driving sleeve being otherwise free from connections that would prevent endwise separation thereof, the side wall of said spacing sleeve being provided on one side opposite said pinion with an opening that terminates short of the upper and lower ends of said spacing sleeve and is adapted to permit engagement of said pinion with an operating rack therefor, the surface of said spacing sleeve below said opening being flattened to permit said surface to clear said operating rack when said pump assembly is inserted in and removed from said pump housing.

. 5. A pump assembly adapted for attachment to and detachment from a pump housing as a complete preassembled unit, said assembly comprising a supporting sleeve, a cylinder supported thereon and extending therebelow, a plunger recipro'cable in said cylinder and means for rotating said plunger in said cylinder, said means comprising a driving sleeve journaled on said cylinder below 'said supporting sleeve -and having a'pinion thereon and an axial slidable but v nonrotatable connection with said plunger, a plunger retracting spring surrounding said sleeve, and a lspacing sleeve interposed between said spring and said supporting sleeve and surrounding vtheupper'portion ofcsaid spring and constituting a support for said driving Vsleeve and a seativ for said spring, said spacing sleeve being provided on one side opposite said pinion with an opening adapted to permit engagement of said pinion with an operating racl; therefor, the surface of said spacing sleeve lbelow said opening being flattened to permit said surface to clear.

said operating rack when said pump assembly is inserted in and removed from said pump housing, the upper edge of said opening being provided with a lug adapted to engage a recess provided therefor in the lower end of said supporting sleeve, thereby preventing relative rotary movement of said supporting sleeve and saidr spacing sleeve but permitting endwise separation thereof.

6. A pump assembly adapted for attachment to and detachment from a .pump housing as a complete preassembled unit, said assembh1 comprising a cylinder, a plunger reciprocable in said cylinder, means for rotating said plunger in said cylinder, said means including a pinion rotatable about the axis of said plunger and having an axial slidable but nonrotatable connection therewith and teethv all of equal width with unobstructed spaces therebetween, and a member located below and rotatable with but removable endwise from said pinion and having a projecting tooth located below two adjacentteeth of said pinion and of a width corresponding substantially to the combined width of said adjacent teeth and the space therebetween, as and for the purpose described.

7. A pump assembly adapted for attachment to and detachment from a pump housing as a complete preassembled unit, said assembly comprising a cylinder, a plunger reciprocable in said cylinder, means for rotating said plunger in said cylinder, said means comprising a pinion journaled on said cylinder and having a continuous series of equally spaced teeth all of equal width and an axial slidablebut nonrotatable connection with said plunger, a nonrotatable member surrounding said pinion and having an opening therein on one side adapted to permit engagement of said pinion with an operating rack therefor, and a washer located in said member and located below and rotatable with but removable endwise from said pinion, said washer having a tooth projecting from the edge thereof, in line vwith and of a width corresponding substantially tothe combined width of two adjacent teeth of said pinion and the space therebetween, as and for the purpose described.

8. A fuel injection pump comprising a housing having a bore therein, a supporting sleeve insertable in and removable endwise from said bore, aV cylinder mounted in said supporting sleeve and extending therebelow, a plunger in said cylinder and means for rotating said plunger y in said cylinder, said means including a pinion journaled on said cylinder and having teeth all of equal width and all with unobstructed spaces therebetween and arack slidable in said housingl and intermeslng withsaid pinion, one of the spaces between 'the teeth of said rack being relatively wide, and a separate member located below l and rotatable with said pinion and having a single projecting tooth of `a size to fit only the wide tooth space of said rack, whereby said pinion is prevented from being meshed with said rack except when said tooth passes through theI teeth all with unobstructed spaces therebetween and a rack intermeshing with ,said pinion, and

a separate member located inwardly of and rotatable with said pinion and adapted to permit enmeshment of said pinion with said rack in only one angular position of said pinion.

10. A fuel injection pump comprising a housing having a bore therein and a pump unit adapted to be inserted in and removed from said bore through the outer end thereof, said unit comprising a sleeve, a cylinder supported thereon and extending beyond the inner end thereof, a plunger reciprocable in said cylinder and means for rotating said plunger in said cylinder, said means comprising a pinion journaled on said cylinder inwardly of said sleeve and having an axial slidable but nonrotatable connection with said plunger, a rack mounted in said housing and intermeshing with said pinion and having a continuous series of equally spaced teeth all of equal lwidth and a wide tooth space adapted to receive two adjacent teeth of said pinion, and a washer rotatable with and located inwardly of said pinion and having a projecting tooth disposed in line with lsaid two adjacent pinion teeth and of a size to t only the wide toothA space of said rack,- whereby said pinion is prevented from being engaged with said rack except when said tooth passes through the wide tooth space thereof.

l1. A fuel injection pump comprising a housing having a vertical bore therein and a pump unit adapted for insertion in and removal from said bore through the outer end thereof, said unit comprising a supporting sleeve fitting in said bore, a cylinder supported in said sleeve and extending therebelow, a plunger reciprocable in said cylinder and means for rotating said plunger in said cylinder, said means comprising a driving sleeve journaled on said cylinder below said supporting sleeve and having a pinion thereon with teeth all of equal width and an axial slidable but nonrotatable connection with vsaid plunger, a rack mounted in said housing and intermeshing with said pinion and having a wide tooth space adapted to receive two adjacent teeth of said pinion, a plunger retracting spring surrounding said sleeve, a member surrounding said pinion and a portion of said driving sleeve located therebelow and constituting a support for said driving sleeve and a seat for said spring, the upper end of said end member being held by said spring in abutting relation to the lower end of said supporting sleeve, said member being providedl on alinement with the bottoms of the teeth of said 1 pinion, and a washer iixed to said driving sleeve below said pinion and having a projecting tooth of a size to iit only the wide tooth space of said thereon spaced apart longitudinally thereof and adapted to actuate the respective tappet cups, said tappet cups having convex spherical cam engaging surfaces and said cams having continuous conical tappet cup engaging surfaces at their peripheral edges that have continuous tangential engagement with the convexly spherical surfaces of said tappet cups at points ofiset from and on the same side of the axes thereof, the conical tappet cup engaging surfaces oi said cams al1 tapering in the same direction.

13. A fuel injection pump comprising a housing having a shouldered bore therein, a supporting sleeve fitting in said bore and supported therein en the shoulder thereof and having a reduced outer end portion projecting ,beyond the outer end of said bore and forming a shoulder on said sleeve, a. pump cylinder mounted in said supporting sleeve, a plunger in said cylinder, and means for angularly adjusting said sleeve in said bore comprising a plate having a nonrotatable connection with the projecting portion of said sleeve and means for securing said plate to said housing in the desired angularly adjusted position oi said sleeve, and a plate removably secured to said housing at the outer end of said bore and cooperating with the shoulder formed by the reduced outer end portion.of said sleeve for holdl ing the latter down on the shoulder in said bore.

14. A pump assembly adapted for attachment to and detachment from a pump housing as a complete preassembled unit, said assembly comprising a supporting sleeve, a cylinder mounted therein and extending therebelow, a plunger in said cylinder, and means for rotating said plunger in said cylinder, said means comprising a driving sleeve journaled on said cylinder below said supporting sleeve and having a pinion thereon and an axial slidable but nonrotatable connection with said plunger, a plunger retracting spring surrounding said driving sleeve, means for preventing endwise separation of said plunger and cylinder, and an annular seat for the upper end of said spring sleeved on said driving sleeve and having an upper sleeve extension surrounding said pinion with its upper end abutting against a shoulder provided therefor on said supporting sleeve, said sleeve extension and said driving sleeve being otherwise free from connections that `would prevent endwise separation thereof.

15. A pump assembly adapted for attachment to and detachment from a pum'p housing as a complete preassembled unit, said assembly comprising a supporting sleeve, a cylinder mounted therein and extending therebelow, a plunger in said cylinder, and means for rotating said plunger in said cylinder, said means comprising a driving sleeve journaled on said cylinder below said supporting sleeve and having a pinion thereon and an axial slidable but nonrotatable connection with said plunger, a plunger retracting spring surrounding said driving sleeve, a seat fixed to said plunger for the lower end of said spring, means for preventing axial disengagement of said cylinder and plunger under the action of' said spring, and an annular seat for the upper end of said spring sleeved on said driving sleeve and having an upper sleeve vextension surrounding said pinion with its upper end abutting against a shoulder provided therefor on said supporting sleeve, said sleeve extension iitting around the lower portion of said supporting sleeve and having a nonrotatable but axially disengageable connection therewith.

16. A fuel injection pump comprising a housing having a bore therein, a supporting sleeve said driving sleeve, a seat on said plunger for the lower end of said spring, means on .said driven sleeve cooperating with means on the portion of the cylinder overlapped thereby for preventing endwise separation of said plunger and cylinder, and an annular seat for the upper end of. said spring sleeved on said driving sleeve an'd having an upper sleeve extension surrounding said pinion with its upper end abuttingagainst-a shoulder provided therefor on said supporting sleeve, said upper sleeve extension and said supporting sleeve being otherwise free from connections that would prevent endwise separation thereof.

17. A fuel injection pump comprising a housing having a bore therein, a supporting sleeve mounted in said bore,v a cylinder 4mounted in said supporting sleeve and extending therebelow, a plunger in said cylinder, and means for rotating said plunger in said cylinder, said means comprising a driving sleeve journaled on said cylinder below said supporting sleeve and having a pinion thereon and an axial slidable but nonrotatable connection with said plunger, a plunger retracting spring surrounding said driving sleeve, and an annular seat for the upper end Aof said spring sleeved on said driving sleeve and having an upper sleeve extension surrounding said pinion with its upper end abutting against a shoulder provided therefor on said supporting sleeve, said sleeve extension fitting around the lower portion of said supporting sleeve and having a nonrotatable but axially disengageable connection therewith comprising a projection on'said sleeve extension seating in a notch in the lower end of said supporting sleeve.

I mRBEaT c. EDWARDS.

//fi winni CERTIFICATE OF CORRECTION. Patent No. 2,185,1146. December 26, 1959.

HERBERT c EDwARDs.

It is hereby certified that error appears in the printed specification i of the above numbered patent requiring correction as follows: Page br, second column, lines 9to lh inclusive, claim, strike out the comma and words said spacing sleeve having anon-rotary connection with said supporting sleeve comprising a tab extending inwardly from the upper edge of said opening and seating ina notch provided therefor in the lower end of said supporting sleeve" and insert the same after "therefor" and before the period, line l?, same claim; page 5, second column, lines 18 and 19, claim lO, strike out "a continuous series of equally spaced teeth all of equal width and" and insert the same before "an" in line l5, same claim; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 12th day of March, A. D. l9llO.

Henry Van Arsdale,

(Seal)AV Acting Commissioner of Patents. 

